Like food, garden chemicals have expiration dates. “Old” products may have broken down and no longer be effective. If you have bottles of weed killers or insecticides from last year (or years before), you should put them aside to go to the next local collection day for hazardous chemicals (usually held in the spring). If you purchase new chemicals, always mark your purchase date prominently so you don’t use products that may no longer do the job, but could still pollute your environment.
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